mean level

基本解释

The mean level of serum calcium, phosphorus and calcium-phosphorus product changed slightly in the following 8 months.
平均血钙、血磷、血钙磷乘积值在后8个月中均保持稳定。
Recently it was found that the nuclear symmetry energy can be directly associated with the mean level density and an iso-vector potential.
最新研究发现原子核对称能与平均的能级密度和同位旋矢量势直接相关。
Table 2 describes the mean level of happiness in the USA in approximately every year between 1972 and 2008 (the most recent year for which data are available).
表2描述了从1972至2008年（最近一年的数据）间大约每年美国幸福的平均水平。

Still,this would only mean that there are community-level outbreaks in at least one other country in a different area of the world.
And the answer is that-- yes it won't make a difference to our wellbeing but it also doesn't mean that we cannot increase our level of wellbeing.
答案是-,是的，它不会改变我们的幸福水平,但并不意味着,我们不能提升自己的幸福水平。
哈佛公开课 - 幸福课课程节选

Mean sea level: average height of the sea surface over a 19-year period.
UNESCO: L O S S A R Y
The idea here is to communicate that ultimate goal of economic production is to raise folks standard of living, by which we mean their level of consumption.
FORBES: How to Grow an Economy